2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/39531The effective field theory approach allows a rigorous disentangling of high and low energy effects in the heavy quarkonium dynamics. Focusing in particular on the spectrum, we describe the nature of the non-perturbative effects and discuss our present knowledge of them.Invited talk presented at the Fifth Workshop on Quantum Chromodynamics, Villefranche-sur-Mer, France, 3-7 January 2000; 9 pages, sprocl.styHigh Energy Physics - PhenomenologyHigh Energy Physics - Latticetext